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How Can I Parse FTP ListDirectoryDetails Responses in C# to Extract File Information Reliably?
How Can I Parse FTP ListDirectoryDetails Responses in C# to Extract File Information Reliably?
Dec 27, 2024 pm 09:08 PM
Parsing FTP ListDirectoryDetails Responses with C#
When monitoring FTP locations for updates, it's essential to extract information from the responses returned by the WebRequestMethods.Ftp.ListDirectoryDetails method. However, different FTP server software presents varying response formats, posing a parsing challenge.
Problem Statement
Given the two common response formats (DOS/Windows and *nix), the task is to find a fully managed C# class that seamlessly handles these differences and extracts the following details:
- File/directory name
- Last updated or created timestamp
- File/directory size
Answer
DOS/Windows Listings
For the first response format (DOS/Windows), the following C# code effectively parses the response:
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/");
request.Credentials = new NetworkCredential("user", "password");
request.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
StreamReader reader = new StreamReader(request.GetResponse().GetResponseStream());
string pattern = @"^(\d+-\d+-\d+\s+\d+:\d+(?:AM|PM))\s+(<DIR>|\d+)\s+(.+)$";
Regex regex = new Regex(pattern);
IFormatProvider culture = CultureInfo.GetCultureInfo("en-us");
while (!reader.EndOfStream)
{
string line = reader.ReadLine();
Match match = regex.Match(line);
string s = match.Groups[1].Value;
DateTime modified =
DateTime.ParseExact(s, "MM-dd-yy hh:mmtt", culture, DateTimeStyles.None);
s = match.Groups[2].Value;
long size = (s != "<DIR>") ? long.Parse(s) : 0;
string name = match.Groups[3].Value;
Console.WriteLine(
"{0,-16} size = {1,9} modified = {2}",
name, size, modified.ToString("yyyy-MM-dd HH:mm"));
}
This code will produce the desired output:
Version2 size = 0 modified = 2011-08-10 12:02 image34.gif size = 144700153 modified = 2009-06-25 14:41 updates.txt size = 144700153 modified = 2009-06-25 14:51 digger.tif size = 144700214 modified = 2010-11-04 14:45
Other (*nix) Listings
For other *nix listings, using the MLSD command is recommended. MLSD returns a machine-readable listing format, eliminating the need for complex parsing.
Alternative Libraries
Using the FtpWebRequest class can be unreliable for this purpose. Consider using third-party libraries like WinSCP .NET assembly, which supports MLSD and can fall back to the LIST command to handle various response formats.
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